angle.h

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#ifndef MF_ANGLE_H_
#define MF_ANGLE_H_

#include <iosfwd>
#include <cmath>
#include "math_constants.h"

namespace mf {


struct angle {
private:
    float radiants_;

public:
    static angle degrees(float d) { return d * radiant_per_degree; }
    static angle radiants(float r) { return r; }    

    angle() = default;
    angle(float r) : radiants_(r) { }
    angle(const angle&) = default;
    
    const float& get_radiants() const { return radiants_; }
    float get_degrees() const { return radiants_ * degree_per_radiant; }
    void set_radiants(float r) { radiants_ = r; }
    void set_degrees(float d) { radiants_ = d * radiant_per_degree; }
    
    operator float& () { return radiants_; }
    operator const float& () const { return radiants_; }
    
    angle& operator=(float r) { radiants_ = r; return *this; }
    angle& operator=(const angle&) = default;
    
    bool operator==(angle a) const { return radiants_ == a.radiants_; }
    bool operator!=(angle a) const { return radiants_ != a.radiants_; }
    
    static angle smallest_between(angle a, angle b);
};

inline angle operator"" _deg(long double deg) {
    return angle::degrees(deg);
}

inline angle operator"" _rad(long double rad) {
    return angle::radiants(rad);
}

std::ostream& operator<<(std::ostream&, angle);
std::istream& operator>>(std::istream&, angle&);

}

#endif